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Science China Materials

, Volume 60, Issue 11, pp 1109–1120 | Cite as

Octahedral PtNi nanoparticles with controlled surface structure and composition for oxygen reduction reaction

  • Yizhong Lu (逯一中)
  • Larissa Thia
  • Adrian Fisher
  • Chi-Young Jung
  • Sung Chul Yi
  • Xin Wang (王昕)
Articles

Abstract

Controlling the surface structure and composition at the atomic level is an effective way to tune the catalytic properties of bimetallic catalysts. Herein, we demonstrate a generalized strategy to synthesize highly monodisperse, surfactant-free octahedral Pt x Ni1−x nanoparticles with tunable surface structure and composition. With increasing the Ni content in the bulk composition, the degree of concaveness of the octahedral Pt x Ni1−x nanoparticles increases. We systematically studied the correlation between their surface structure/composition and their observed oxygen reduction activity. Electrochemical studies have shown that all the octahedral Pt x Ni1−x nanoparticles exhibit enhanced oxygen reduction activity relative to the state-of-the-art commercial Pt/C catalyst. More importantly, we find that the surface structure and composition of the octahedral Pt x Ni1−x nanoparticles have significant effect on their oxygen reduction activity. Among the studied Pt x Ni1−x nanoparticles, the octahedral Pt1Ni1 nanoparticles with slight concaveness in its (111) facet show the highest activity. At 0.90 V vs. RHE, the Pt mass and specific activity of the octahedral Pt1Ni1 nanoparticles are 7.0 and 7.5-fold higher than that of commercial Pt/C catalyst, respectively. The present work not only provides a generalized strategy to synthesize highly monodisperse, surfactant-free octahedral Pt x Ni1−x nanoparticles with tunable surface structure and composition, but also provides insights to the structure-activity correlation.

Keywords

PtNi octahedral concave surface structure oxygen reduction reaction 

具有可控表面结构和组成的PtNi八面体纳米粒子的氧还原活性研究

摘要

双金属催化材料的催化性质可以通过在原子水平下控制材料的表面结构和组成进行有效调节. 本文发展了一种普适性的方法合成 具有高度分散性、洁净表面和可调的表面结构和组成的Pt x Ni1−x八面体纳米粒子. 研究发现在反应过程中, 通过增加Ni前驱体的含量, 合成 的Pt x Ni1−x八面体纳米粒子的(111)晶面的凹陷程度逐渐加大. 我们系统研究了Pt x Ni1−x八面体纳米粒子的表面结构或组成与其氧还原电催化 活性之间的相互关系. 电化学研究结果表明所有的Pt x Ni1−x八面体纳米粒子均表现出比标准商业Pt/C催化剂更高的氧还原活性. 更重要的 是, 我们发现Pt x Ni1−x八面体纳米粒子的表面结构和组成对其氧还原电催化活性具有很大的影响. 研究发现, 具有轻微(111)晶面凹陷程度的 Pt1Ni1八面体纳米粒子显示出最高的氧还原电催化活性. 在0.9 V(相对于标准氢电极)电势条件下, Pt1Ni1八面体纳米粒子的氧还原质量活性 和面积活性分别为标准商业Pt/C催化剂的7.0和7.5倍. 该研究不仅提供了一种普适性的方法合成具有高度分散性、洁净表面和可调的表面 结构和组成的Pt x Ni1−x八面体纳米粒子, 同时可为理解催化材料的结构-性质相互关系规律提供指导.

Notes

Acknowledgments

This research was supported by the National Research Foundation, PrimeMinister’s Office, Singapore under its CREATE Programme. We also acknowledge financial support by the Defence Acquisition Program Administration and Agency for Defence Development (UD120080GD), Republic of Korea.

Supplementary material

40843_2017_9029_MOESM1_ESM.pdf (4.9 mb)
Octahedral PtNi nanoparticles with controlled surface structure and composition for oxygen reduction reaction

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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Yizhong Lu (逯一中)
    • 1
    • 2
  • Larissa Thia
    • 1
  • Adrian Fisher
    • 3
  • Chi-Young Jung
    • 4
  • Sung Chul Yi
    • 5
  • Xin Wang (王昕)
    • 1
  1. 1.School of Chemical and Biomedical EngineeringNanyang Technological UniversitySingaporeSingapore
  2. 2.Cambridge Centre of Advanced Research in Energy Efficiency in Singapore (CARES)SingaporeSingapore
  3. 3.Department of Chemical Engineering and BiotechnologyUniversity of CambridgeCambridgeUK
  4. 4.Hydrogen and Fuel centerKorea Institute of Energy Research (KIER)Jellabuk-doRepublic of Korea
  5. 5.Department of Chemical EngineeringHanyang UniversitySeoulRepublic of Korea

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